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kkboy1
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LeAudio

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multiplexed stream each earbud then has to decode the stream they require discarding the
other it is a less efficient option but allows earbuds to swap streams if they detect that the
user has turned around so has application in d sound and virtual reality headsets particularly
if additional spatial audio content is available
the configurations shown above are only a small selection of the possible combinations and
not every in itiator and acceptor will support all of them bap lists different combinations
of stream configuration which is not exhaustive mandating the most common ones and
applying conditional and optional requirements on the others table shows the
requirements for connections between an initiator and a single acceptor m means that they
are mandatory and must be supported by bluetooth le audio compliant devices c is a
condit ional support which is generally based on whether a device supports bidirectional
streams o means that support is optional full details of these including what the conditional
requirements are can be found in tables and of bap
section multi channel lc audio
audio conf igurations to and involve two streams in table they bear the suffix
i indicating that they refer to the use case where a single acceptor is involved in both streams
and is therefore supporting two cises
audio
configuration stream
direction
initiator
acceptor unicast broadcast
initiator acceptor initiator acceptor
m m
not applicable m m
c c
o c
c c
i
m o
i
c c
i
c c
i
m c
o c
i
c c
not applicable m m
m c
o c
table stream configuration requirements for single acceptors denoted as i
chapter lc latency and qos
table shows the requirements where the initiator establishes the streams with a pair of
acceptors with one cis connected to each these are denote d by a suffix ii
audio
configuration stream
direction
initiator
acceptor unicast broadcast
initiator acceptor initiator acceptor
ii
m o
not applicable ii
c c
ii
c c
ii
m c
ii
c c
table stream configuration requirements for sets of two acceptors denoted as ii
many other combinations are possible but a bluetooth le audio device cannot automatically
expect them to be supported on an initiator or acceptor an initiator can determine su pport
for other configurations from the pac records and additionalaseparameters values in the
codecspecificconfigurations
additional codecs
the lc is a very good codec which can be used across a wide range of sampling rates for
voice and music appli cations it is mandatory for every bluetooth le audio device to
support it at the khz and khz sampling rates initiators only need to support khz as
some public address systems may be voice only but the majority of implementations are
likely to support higher sampling frequencies
despite that there are specialised applications where other codecs may perform better to
accommodate this the bluetooth le audio specifications allow the use of additional codecs
or vendor specific codecs
additiona l codecs used to be called optional codecs in adp these are codecs which are
designed by external specification bodies or companies but the bluetooth specifications
include configuration information that allow qualified devices to recognise that they e xist
and how to set them up this allows multiple manufacturers to add the capability to use
them without that a connection would default back to the mandatory bluetooth codec
normally additional codecs are licensable from external standards organis ations so anyone
can integrate them into their product currently no additional codec s are defined for
section additional codecs
bluetooth le audio
vendor specific codecs are ones which are licensed by manufacturers who provide that
bluetooth configuration information to their licensees other bluetooth products would not
understand that information so would ignore them and use the mandatory codec or an
additional codec if they supported it vendor codecs are proprietary and outside the scope
of the bl uetooth specifications where they are used the codecid is set to vendor
specific
chapter cap and csips
chapter cap and csips
within the generic audio framework of the bluetooth le audio set of specifications the
four baps specifications the basic audio profile the audio stream control service the
broadcast audio scan service and the published audio capabilities service do most of the
heavy lifting if you implement these four specifications you can build almost any unicast or